Audio-HVAC Subdisplay Does Not Work Properly

Audio-HVAC subdisplay does not work properly

1. Check the clock. Reset if necessary.

Does the clock reset?

YES - The system is OK at this time.

NO - Go to step 2.

2. Check for an open or short to body ground between subdisplay unit 10P connector terminal No. 4, No. 5, No. 6, No. 7 and navigation unit connector A (10P) terminal No. 4, No. 5, No. 6, No. 7.

Are the circuits OK ?

YES - Replace the navigation unit.

NO - Repair the circuits.